21667054 has 8 divisors (see below), whose sum is σ = 32540040. Its totient is φ = 10820376.

The previous prime is 21667021. The next prime is 21667091. The reversal of 21667054 is 45076612.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21667054² = 938922458077832, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4369 + ... + 7900.

It is an arithmetic number, because the mean of its divisors is an integer number (4067505).

Almost surely, 2^21667054 is an apocalyptic number.

21667054 is a deficient number, since it is larger than the sum of its proper divisors (10872986).

21667054 is a wasteful number, since it uses less digits than its factorization.

21667054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13154.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 21667054 is about 4654.7882873445. The cubic root of 21667054 is about 278.7832148212.

The spelling of 21667054 in words is "twenty-one million, six hundred sixty-seven thousand, fifty-four".